The Underpotential Determination of Lead Using the Laboratory-made Gold Electrode Flow Cell
Prinya Masawat and Saisunee Liawruangrath* Author for corresponding; e-mail address: prinyam@nu.ac.th
Volume: Vol.35 No.2 (MAY 2008)
Research Article
DOI:
Received: 16 January 2009, Revised: -, Accepted: 21 Febuary 2009, Published: -
Citation: Masawat P. and Liawruangrath S., The Underpotential Determination of Lead Using the Laboratory-made Gold Electrode Flow Cell, Chiang Mai Journal of Science, 2008; 35(2): 355-369.
Abstract
The analysis of lead(II) by continuous flow square-wave anodic stripping voltammetry (SWASV) at a gold electrode flow cell is described. Various experimental variables have been optimized to yield low detection limit and good precision. The detection limits for a 30 s and 600 s electrodeposition were 3.5 and 0.38 μg L-1, respectively. The recoveries were found to be 113 +/- 1.8 % and 108 +/- 2.3 % (n=5) in spiked drinking water samples and 110 +/- 4.8 % and 106 3.4% (n=5) in spiked tap water samples. Reproducibility on measurement of solution containing 5 μg L-1 lead (II) (%R.S.D., n = 20) was 2.1 %. Measurements in the presence of typical interferences such as copper(II), cadmium(II), zinc(II), iron(II), chromium(VI), and mercury are also reported.